Clock



FIG. 1 is a right-front perspective view of a clock showing our new design on its base;

FIG. 2 is a front face elevational view thereof;

FIG. 3 is a rear elevational view of FIG. 2;

FIG. 4 is a right side elevational view of FIG. 1, the left side being a mirror image; and,

The FIG. 1 view is on a reduced scale from FIGS. 2-4. 

The ornamental design for a clock, as shown and described. 